US10935771B2ActiveUtilityA1

Lens system

53
Assignee: ANTERYON WAFER OPTICS B VPriority: Dec 21, 2017Filed: Jan 25, 2019Granted: Mar 2, 2021
Est. expiryDec 21, 2037(~11.5 yrs left)· nominal 20-yr term from priority
Inventors:Edwin Maria WolterinkYelena Vladimirovna Shulepova
G02B 13/004G02B 13/006G02B 13/0085
53
PatentIndex Score
0
Cited by
14
References
24
Claims

Abstract

The present invention relates to an optical unit consisting of four lens groups, i.e., a first lens group, a second lens group, a third lens group and a fourth lens group, which are arranged in order from an object side toward an image side surface side, wherein at least the first, second and third lens group comprise at least two lens elements, wherein said at least two lens elements within each lens group have different optical properties, wherein no glass substrate is present in at least one of the first lens group, the second lens group and the third lens group.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
       1. An optical unit consisting of four lens groups, comprising a first lens group, a second lens group, a third lens group and a fourth lens group, which said lens group are arranged in order from an object side toward an image side surface side, wherein at least the first, second and third lens group each comprise at least two lens elements, wherein said at least two lens elements within each lens group have different optical properties, wherein no glass substrate is present in at least one of the first lens group, the second lens group and the third lens group. 
     
     
       2. An optical unit according to  claim 1 , wherein within one or more of the first lens group, the second lens group and the third lens group said at least two lens elements of said lens group are in contact with each other, wherein no glass substrate is present between said at least two lens elements. 
     
     
       3. The lens system according to  claim 1 , wherein each of said lens elements has been manufactured according replication technology. 
     
     
       4. An optical unit according to  claim 1 , wherein no glass substrate is present in the second lens group and the third lens group. 
     
     
       5. An optical unit according to  claim 1 , wherein no glass substrate is present in the first lens group. 
     
     
       6. An optical unit according to  claim 1 , wherein said fourth lens group comprises one lens element. 
     
     
       7. An optical unit according to  claim 6 , wherein said fourth lens group is positioned onto an image sensor. 
     
     
       8. An optical unit according to  claim 6 , wherein said fourth lens group is of a field corrector lens type. 
     
     
       9. An optical unit according to  claim 1 , wherein said fourth lens group comprises at least two lens elements, wherein said at least two lens elements within said fourth lens group have different optical properties, wherein no glass substrate is present in said fourth lens group. 
     
     
       10. An optical unit according to  claim 1 , wherein the thickness of at least one lens element within the first, second and third and fourth lens group is above about 30 micron, preferably above about 50 micron, and below about 1000 micron, preferably below about 300 micron, wherein the thickness is determined by the shortest path of the light rays through a lens group. 
     
     
       11. An optical unit according to  claim 1 , wherein the range of index (n) and Abbe properties in the first lens group are:
 Lens element A ( 105 A, L 1 ): 1.5<n<1.8, 40<Abbe<80, 
 Lens element B ( 105 B, L 2 ): 1.4<n<1.8, 20<Abbe<50, preferably 20<Abbe<40, wherein the term “A” refers to a lens element toward an object side and term “B” refers to a lens element towards an image surface side. 
 
     
     
       12. The optical unit according to  claim 1 , wherein the range of index (n) and Abbe properties in the second lens group are:
 Lens element C ( 106 C, L 3 ): 1.4<n<1.8, 20<Abbe<50, preferably 20<Abbe<40, 
 Lens element D ( 106 D, L 4 ): 1.5<n<1.8, 40<Abbe<80, wherein the term “C” refers to a lens element toward an object side and term “D” refers to a lens element towards an image surface side. 
 
     
     
       13. The optical unit according to  claim 1 , wherein the range of index (n) and Abbe properties in the third lens group are:
 Lens element E ( 107 E, L 5 ): 1.5<n<1.8, 30<Abbe<80, preferably 40<Abbe<80, 
 Lens element F ( 107 F, L 6 ): 1.5<n<1.8, 30<Abbe<80, preferably 40<Abbe<80, wherein the term “E” here refers to a lens element toward an object side and term “F” refers to a lens element towards an image surface side. 
 
     
     
       14. The optical unit according to  claim 1 , wherein the range of index (n) and Abbe properties in the fourth lens group are:
 Lens element G ( 108 G, L 7 ): 1.5<n<1.8, 30<Abbe<80, preferably 40<Abbe<80, 
 Lens L 8 : 1.5<n<1.8, 30<Abbe<80, 
 
       wherein the term “G” here refers to a lens element toward an object side and term “L 8 ” refers to a lens element towards an image surface side. 
     
     
       15. The optical unit according to  claim 1 , wherein the range of index (n) and Abbe properties in the first lens group are according to the next equation:
     n (lens element  B (105 B,L 2)minus lens element  A (105 A,L 1))=0.02<delta<0.2, preferably 0.05<delta<0.2, 
 Abbe (lens element A ( 105 A, L 1 ) minus lens element B( 105 B, L 2 ))=10<delta<40, preferably 15<delta<40, wherein the term “A” refers to a lens element toward an object side and term “B” refers to a lens element towards an image surface side. 
 
     
     
       16. The optical unit according to  claim 1 , wherein the range of index (n) and Abbe properties in the second lens group are according to the next equation:
     n (lens element  D (106 D,L 4) minus lens element  C (106 C,L 3))=0.01</delta/<0.3 
 Abbe (lens element C ( 106 C, L 3 ) minus lens element D ( 106 D, L 4 ))=10</delta/<40, wherein the term “C” refers to a lens element toward an object side and term “D” refers to a lens element towards an image surface side. 
 
     
     
       17. The optical unit according to  claim 1 , wherein the range of index (n) and Abbe properties in the third lens group are according to the next equation:
     n (lens element  F (107 F,L 6) minus lens element  E (107 E,L 5))=0</delta/<0.3 
 Abbe (lens element E ( 107 E, L 5 ) minus lens element F ( 107 F, L 6 ))=0</delta/<40, wherein the term “E” here refers to a lens element toward an object side and term “F” refers to a lens element towards an image surface side. 
 
     
     
       18. The optical unit according to  claim 1 , wherein in one or more of said four lenses groups one or more additional layers are present, chosen form the group of integrated intermediate substrates, IR filters, UV filters, apertures and diaphragms, or combinations thereof. 
     
     
       19. The optical unit according to  claim 18 , wherein a diaphragm is positioned in the first lens group, especially positioned between lens element A ( 105 A, L 1 ) and lens element B ( 105 B, L 2 ), wherein the term “A” refers to a lens element toward an object side and term “B” refers to a lens element towards an image surface side. 
     
     
       20. The optical unit according to  claim 18 , wherein a diaphragm is positioned in the second lens group, especially positioned between lens element C ( 106 C, L 3 ) and lens element D ( 106 D, L 4 ), wherein the term “C” refers to a lens element toward an object side and term “D” refers to a lens element towards an image surface side. 
     
     
       21. The optical unit according to  claim 1 , wherein the materials of each of said lens elements are chosen from the group of UV curable polymers, preferably epoxy, acrylic and nylon type polymers. 
     
     
       22. A stack of a lens assembly, wherein said stack comprises an optical unit according to  claim 1 . 
     
     
       23. The stack according to  claim 22 , wherein said individual four lenses groups from said optical unit are stacked by using spacers and/or adhesives. 
     
     
       24. The stack according to  claim 22 , further comprising one or more of an image sensor, a sensor cover plate and a cover plate.

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